1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include "textflag.h" 6 7 // Called by C code generated by cmd/cgo. 8 // func crosscall2(fn func(a unsafe.Pointer, n int32, ctxt uintptr), a unsafe.Pointer, n int32, ctxt uintptr) 9 // Saves C callee-saved registers and calls fn with three arguments. 10 TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0 11 // Start with standard C stack frame layout and linkage. 12 13 // Save R6-R15 in the register save area of the calling function. 14 STMG R6, R15, 48(R15) 15 16 // Allocate 96 bytes on the stack. 17 MOVD $-96(R15), R15 18 19 // Save F8-F15 in our stack frame. 20 FMOVD F8, 32(R15) 21 FMOVD F9, 40(R15) 22 FMOVD F10, 48(R15) 23 FMOVD F11, 56(R15) 24 FMOVD F12, 64(R15) 25 FMOVD F13, 72(R15) 26 FMOVD F14, 80(R15) 27 FMOVD F15, 88(R15) 28 29 // Initialize Go ABI environment. 30 BL runtimeload_g(SB) 31 32 MOVD R3, 8(R15) // arg1 33 MOVW R4, 16(R15) // arg2 34 MOVD R5, 24(R15) // arg3 35 BL (R2) // fn(arg1, arg2, arg3) 36 37 FMOVD 32(R15), F8 38 FMOVD 40(R15), F9 39 FMOVD 48(R15), F10 40 FMOVD 56(R15), F11 41 FMOVD 64(R15), F12 42 FMOVD 72(R15), F13 43 FMOVD 80(R15), F14 44 FMOVD 88(R15), F15 45 46 // De-allocate stack frame. 47 MOVD $96(R15), R15 48 49 // Restore R6-R15. 50 LMG 48(R15), R6, R15 51 52 RET 53 54
